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Restructuring and Other	3 Months Ended
Restructuring and Other	Apr. 03, 2022
Restructuring and Related Activities [Abstract]
Restructuring and Other	O. RESTRUCTURING AND OTHER During the three months ended April 3, 2022, Teradyne recorded a charge of $14.7 million related to the arbitration claim filed against Teradyne and AutoGuide related to an earn-out dispute, which was settled on March 25, 2022 for $26.7 million. Previously, in the three months ended December 31, 2021, Teradyne recorded a charge of $12.0 million related to this earn-out dispute. During the three months ended April 4, 2021, Teradyne recorded a gain of $7.2 million for the decrease in the fair value of the AutoGuide contingent consideration liability.